જો $3 f(x)-2 f\left(\frac{1}{x}\right)=x$ હોય,તો $f^{\prime}(2)$ ની કિંમત શોધો.

  • A
    $\frac{1}{2}$
  • B
    $\frac{-1}{2}$
  • C
    $1$
  • D
    $-1$

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$\frac{d}{dx}({x^2} + \cos x)^4 = $

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